globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.01.003
Scopus记录号: 2-s2.0-85009888035
论文题名:
Timing and process of river and lake terrace formation in the Kyrgyz Tien Shan
作者: Burgette R.J.; Weldon R.J.; II; Abdrakhmatov K.Y.; Ormukov C.; Owen L.A.; Thompson S.C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 159
起始页码: 15
结束页码: 34
语种: 英语
英文关键词: Aggradation ; Central Asia ; Incision ; Issyk-Kul ; Lake level ; Quaternary ; Terraces ; Tien Shan
Scopus关键词: Deformation ; Glacial geology ; Rivers ; Timing circuits ; Aggradation ; Central Asia ; Incision ; Issyk-Kul ; Lake levels ; Quaternary ; Terraces ; Tien Shan ; Lakes ; aggradation ; cosmogenic radionuclide ; deglaciation ; geological mapping ; Holocene ; lake level ; Pleistocene ; radiocarbon dating ; river terrace ; surveying ; uplift ; Kyrgyzstan ; Tien Shan ; Ysyk-Kol
英文摘要: Well-preserved flights of river and lake terraces traverse an actively deforming rangefront, and form a link between glaciated mountains and a large intermontane lake in the Issyk-Kul basin of the Kyrgyz Tien Shan. We investigated the history and geometry of these lake and river terraces using geologic mapping, surveying, and radiocarbon and terrestrial cosmogenic nuclide dating. A prominent late Pleistocene highstand of the lake occurred over at least the period of 43–25 ka, followed by a period of deep regression and subsequent rise of the lake to the modern sill level in the late Holocene. Major aggradation of the most prominent latest Quaternary river terrace along the Ak-Terek and Barskaun rivers likely started at ∼70–60 ka, coincident to the local last glacial maximum in this region. In contrast to some models of aggradation and incision, the rivers appear to have stayed near the top of the fill for >20 ka, incising subtly below the top of this fill by ∼37 ka, locally. Deep incision likely did not occur until the peak deglaciation in the latest Pleistocene. Older dated terrace surfaces are consistent with one major terrace-forming event per glacial, constant deformation and incision rates, and typical fluvial gradients lower than the modern incising streams. The dating confirms regional terrace correlations for the most prominent late Quaternary terraces, but correlating higher terraces is complicated by spatially varying uplift rates and preferential terrace preservation between basins in the Tien Shan. © 2017 Elsevier Ltd
资助项目: This work was supported by NSF grant INT-0209874. We thank students of the Tien Shan International Geologic Field Camp for assistance with fieldwork. Radiocarbon and cosmogenic nuclide dating was partially supported by grants from the Geological Society of America and the American Association of Petroleum Geologists. Thanks to Michele Koppes, Nicole Davis, and Jason Dortch for providing assistance with processing cosmogenic nuclide samples. Damien Delvaux provided the bathymetric DEM of Issyk-Kul from De Batist et al. (2002). We thank Josh Roering for helpful comments on an earlier version of this manuscript. We thank two anonymous reviewers for constructive comments that improved the clarity of this paper.
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被引频次[WOS]:17   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59307
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作者单位: University of Oregon, Department of Geological Sciences, 1272 University of Oregon, Eugene, OR, United States; New Mexico State University, Department of Geological Sciences, PO Box 30001, MSC 3AB, Las Cruces, NM, United States; Kyrgyz Institute of Seismology, 52/1, Asanbai Microdistrict, Bishkek, United States; Department of Geology, University of Cincinnati, Cincinnati, OH, United States; Lettis Consultants International, 1981 N Broadway, Suite 330, Walnut Creek, CA, United States

Recommended Citation:
Burgette R.J.,Weldon R.J.,II,et al. Timing and process of river and lake terrace formation in the Kyrgyz Tien Shan[J]. Quaternary Science Reviews,2017-01-01,159
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